4. Season Ratings
• 1 Season Sleeping Bags - lightweight, compact and ideal for use in hot summer months (June-August) or when camping abroad in hotter countries.
• 2 Season Sleeping Bags - ideal for use in late spring to early autumn, your typical family camping sleeping bag.
• 3 Season Sleeping Bags - for use in early spring to late autumn, and perhaps a mild winter evening. These bags are generally the sort of sleeping bag recommended for school trips and expeditions such as Duke of Edinburgh.
• 4 Season Sleeping Bags - thick bags, often down insulated 4 season sleeping bags are made for use in winter when temperatures can drop below zero.
• 5 Season Sleeping Bags - these sleeping bags, also known as expedition bags are for high mountain use and for extreme cold temperatures. [2]

5. Other Features To Consider:
• Shell fabric treated with a durable water repellent (DWR) finish to allow water to bead up rather than soak through the fabric.
• Hood - so you won`t lose a lot of heat through your head.
• Pockets - so you can keeps small items.
• Sleeping pad sleeve - no more rolling off the sleep pad in the middle of the night.
• Baffles - hold the filling so it is evenly distributed.
• Two-way zip - useful for easy opening when ventilation is required.
• Insulated zip baffle - helps reduce heat lose.
• Insulated draft collar - helps to stop body heat escaping from the bag.

6. What Other Users Have Said
There is a great advantage if you buy your sleeping bag online is that you can see directly the opinions of other users.

And that is why large and trusted online retailer like Amazon.com displaying their customer reviews including the star rating. It will give you a real picture of a product you plan to buy.

The more the number of buyer reviews and the higher the star rating, the better the product in the eyes of consumers.

For your information, people who can submit a product review on Amazon.com must make the purchase first. So rest assured, you will get an honest review from them.